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Name:___________practice_______________ Cell Biology Unit #2 Quiz
20 points
Multiple Choice (1 pt each): Choose the one best answer for each question on scantron (please double check for smears) and put
“written” answers on the paper provided.
---------------------------------------------------------------------------------1) PL membranes from a given number of cells creates a phospholipid monolayer that is twice the surface area of the original cell.
(note: there were two equal flaws in their original math)
A) Gorter and Grendel B) Singer and Nicolson C) Overton D)Unwin and Henderson
2) Who coined the term “Fluid Mosaic Model”?
A) Gorter and Grendel B) Singer and Nicolson C) Overton D) Unwin and Henderson
3) To determine the amino acid sequence of a transmembrane protein is generally harder to do what?
a) Extract the membrane protein and determine sequence by cutting off one amino acid at a time
b) Determine its amino acid sequence from the DNA in the gene used to produce it.
3) a) True b) False: Because they are hydrophyllic, triglycerides form an integral part of the membrane lipid bilayer.
4) ______unsaturated fatty acids create spaces inside the lipid bilayer.
a) Cis b) Trans c) None of above are appropriate
5) The ____end of a transmembrane protein is typically found on the extracellular side and the ______end is typically found on the
intracellular side.
a) Amino (-NH3+), Carboxyl (-CO2-)
b) Carboxyl (-CO2-), Amino (-NH3+)
6) If you wanted to link a carbohydrate to an amino acid on a membrane protein, which amino acid would be a good choice for a
linkage that utilized a hydroxyl group?
a) Asparagine b) Serine c) Glycine
7) Aquaporin is a membrane protein that makes tiny pores in the epithelial cells of the collecting duct of the kidney permeable to
water. This is an example of a _____________.
a) Carrier protein b) Channel protein
c) Active transport protein
8) a) True b) False: Treatment of an animal cell with an competitive inhibitor that is specific for the Na+/K+-ATPase pump would be
likely to affect cell volume and vmax for the enzyme.
9) If increasing substrate concentrations linearly resulted in an increased appearance of substrate inside a cell (no V max) what type of
transport was involved?
a) Facilitated Diffusion b) Passive Diffusion c) Active Transport
d) Secondary-active transport
10) If the same number of sodium ions and glucose molecules appeared inside a cell , transport by a ______carrier would be
suspected.
a) Antiport
b) Symport
c) Uniport
11) Which molecule is least able to cross a plasma membrane by simple diffusion due to its sphere of hydration?
a) Water b) Bicarbonate c) Carbon dioxide d) Triglyceride
12) There are four types of transmembrane ATP-ase, which one is most important for moving very large molecules across the
membrane?
a) P-type
b) V-type
c) ABC-type
13) a) True b) False Osmosis occurs across a membrane when the solute (sodium) can move down its concentration gradient
across the membrane, but the solvent (water) cannot.
14) The Na+/K+-ATPase pumps ____sodium ions out of a cell and ___potassium ions into a cell for each ATP used.
a) 1,1
b) 2,3
c) 3,2
d) 3,3 e) 2,2
15) Which of the following could increase the flux of a molecule into a cell?
a) Increased surface area
b) Increased concentration gradient
c) Decreased plasma membrane width d) Increased environmental temperature
e) All of above
16) a) True b) False: Allosteric regulation occurs when a compound forms a covalent bond with the target enzyme, cause a
permanent change in its function and regulation of its enzyme activity.
Written Questions: Please use the paper provided, ask for additional paper if you need it.
17) With determines the fluidity of a plasma membrane for cells found in different environmental temperatures? Give specific
examples or include diagrams if this helps (2 pts: 30-50 words)
18) How do cells move a substrate into a cell against a concentration gradient? Give specific examples or include diagrams if this
helps (2 pts: 30-50 words)
19) Extra Credit: 2 points
Draw a Plasma Lipid Bilayer with at least 10 items, structures, or functions associated with it clearly labeled.